Year of examination, birth year, number and participation percentage, the Tromsø Study 1979–2008
| Year of screening | Birth year | n (%)* | |
| Tromsø 2 | 1979–1980 | 1925–1959† | 16 620 (85) |
| Tromsø 3 | 1986–1987 | 1925–1966‡ | 21 826 (82) |
| Tromsø 4 | 1994–1995 | 1897–1969 | 27 158 (77) |
| Tromsø 4 visit 2 | 1994–1995 | 1910–1969 | 7965 (78) |
| Tromsø 5 | 2001–2002 | 1912–1971 | 8130 (79) |
| Tromsø 5 visit 2 | 2001–2002 | 1912–1971 | 5939 (85) |
| Tromsø 6 | 2007–2008 | 1920–1977 | 12 984 (66) |
| Tromsø 6 visit 2 | 2007–2008 | 1920–1969 | 7307 (92) |